Vehicle–Vehicle Channel Models for the 5-GHz Band

DISSERTATION The Vehicular Radio Channel in the 5 GHz Band

In this thesis I present a methodology, in order to characterize the time-variant vehicular radio channel. The radio channel is part of the communication system, which the engineer cannot influence. Therefore it has to be characterized in a way that the transmitters and receivers can be well designed, for specific applications. For this characterization we carried out two vehicular radio channe...

Wireless Channel Characterization in the 5 GHz Microwave Landing System Extension Band for Airport Surface Areas

ALMA Band 5 (163-211 GHz) Sideband Separation Mixer Design

We present the design of ALMA Band 5 sideband separation mixer based on Niobium superconducting SIS junctions and first experimental results for the double side band mixer. In this mixer the LO injection circuitry is integrated on the mixer substrate using a microstrip line directional coupler with slot-line branches in the ground plane. The isolated port of the LO coupler is terminated by a wi...

GHz AND 5 . 8 GHz COMPACT DUAL - BAND CIRCULARLY POLARIZED PATCH ANTENNA

A dual-band circularly polarized stacked microstrip antenna for ISM Bands (2.45GHz & 5.8GHz) applications is designed and implemented. By stacking two different corner-truncated square patches in a dielectric substrate layer, the microstrip antenna for dual-frequency circular polarization (CP) can be achieved with −11.5 dB and −12.8 dB measured return loss for 2.45GHz and 5.8GHz. Semicircular g...

A cooperative transponder system for improved traffic safety, localizing road users in the 5 GHz band

We present a multi-user cooperative mobile transponder system which enables cars to localize pedestrians, bicyclists and other road users in order to improve traffic safety. The system operates at a center frequency of 5.768 GHz, offering the ability to test precision localization technology at frequencies close to the newly designated automotive safety related bands around 5.9 GHz. By carrying...